LXXXVI PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Congress, 2d Session, Senate, Doc. No. 225. Washington, 1842. 8vo, 
26 pp. and 3 folding plates. 
58. — Bache, a. D., & McCulloh, R. S. Reports from the Secretary of 
the Treasury, of scientific investigations in relation to sugar and hydrome¬ 
ters, made, under the superintendence of Prof. A. D. Bache, by Prof. R. S., 
McCulloh. 30th Congress, 1st Session, Senate, Ex. Doc. No. 50. Wash¬ 
ington, 1848. 8vo, pp. 653. 
59. — Bache ; Prof. Alexandeb, D. Report to the Treasury Department 
on the progress of the work of constructing standards of weights and measures 
for the custom-houses, and balances for the States, and in supplying stand¬ 
ard hydrometers to the custom-houses, from 1 Jan., 1848, to 31 Dec., 1856. 
34th Congress, 3d Session, Senate, Ex. Doc. ISo. 27. Washington, 1857. 
8vo, 218 pp. with 6 folding plates. (Contains descriptions of yard dividing 
engine, and various comparators.) 
60. — Rogers ; Prof. W. A. On the present state of the question of stand¬ 
ards of length. (Contains a bibliography.) Proceed. Amer. Acad, of Arts 
and Sciences, 1879-80. Vol. 15. pp. 273-312. 
61. — Rogers; Prof. W. A. On two forms of comparators for measures 
of length. 8vo, 12 pp. American Quarterly Microscopical Journal, April, 
1879. 
62. —Rogers; Prof. Wm. A. Studies in metrology. 5 Plates. (Con¬ 
tains description of the Rogers-Bond universal comparator.) Proceed. 
Amer. Acad, of Arts and Sciences, l882-’3. Yol. 18, pp. 287-398. 8vo. 
63. — Rogers ; Prof. W. A. An examination of the standards of length 
constructed by the Societe Genevoise. Proceed. Amer. Acad, of Arts and 
Sciences, 1884-’5. Yol. 20, pp. 379-389. 8vo. 
64. —Rogers; Prof. W. A. A study of the centimeter marked ‘‘A,’^ 
prepared by the U. S. Bureau of Weights and Measures for the Committee 
on Micrometry. 8vo, 23 pp. Proc. Amer. Society of Microscopists. Yol. 
32, p. 184. 
65 — Rogers; Prof. Wm. A. On a practical solution of the perfect screw 
problem. 8vo, 44 pp. Trans. Amer. Soc. of Mechanical Engineers. Yol. 5. 
66. —Rogers ; Prof. W. A. A critical study of the action of a diamond 
in ruling lines upon glass. 8vo, 17 pp. Proc. Amer.*Society of Microscop¬ 
ists. Yol. 32, p. 149. 
67. —Travaux et memoires du Bureau International des Poids et Mesures, 
publics sous Pautorite du Comite International, par le Directeur du Bureau. 
Paris. 4to. Tome 1, 1881, 391 pp.; T. 2, 1883, 413 pp.; T. 3, 1884, 348 
pp.; T. 4, 1885, 421 pp.; T. 5, 1886, 416 pp. 
